package collection;

import java.util.ArrayList;
import java.util.Collection;

/**
 * 说明:
 *
 * @author: luohaowei
 * @date:2023/3/2
 **/
public class CollectionDemo {
    public static void main(String[] args) {
        Collection c=new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,0));
        c.add(new Point(1,2));
        System.out.println(c);
        Point p=new Point(1,2);
        boolean contains =c.contains(p);
        System.out.println("是否包含:"+contains);
        /*
        boolean remove(Object o):-----一般不都不接收boolean结果
        从当前集合中删除与给定元素o的equals()比较true的元素
        若存在重复元素则只删除一次
         */
        c.remove(p);
        System.out.println(c);
        //集合中存放的是元素的引用
        Collection cc=new ArrayList();
        Point pp=new Point(1,2);
        cc.add(pp);//将pp添加到cc中-------将pp的引用装到cc中
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);
        pp.setX(100);
        System.out.println("pp:"+pp);
        System.out.println("cc:"+cc);



































        /*
        Collection c= new ArrayList();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        System.out.println(c);//[one,two,three,four,five]
        //集合重写object的toString()方法,返回格式如下
        //[元素1.toString(),元素2.toString(),元素3.toString(),......]
        System.out.println("size:"+c.isEmpty());
        c.clear();
        System.out.println("集合已清空");
        System.out.println(c);
        System.out.println("size:"+c.size());
        System.out.println("是否为空集:"+c.isEmpty());

         */
    }
}
